Suggestions
As mentioned, Oshawa bylaws are very restrictive and ARE enforced.
You should definitely look them up for the location you want.
You might have to try Courtice/Bowmanville or Whitby.
Stick to a discreet industrial area not frequented by soccer moms.
Ads in the local This Week and word of mouth is more than enough for business.
Minimizing your fixed expenses will reduce the cost of relocation if necessary, e.g. the furniture you can move with you but renos can be limited to a clean floor, workable plumbing, and a cheap paint job.
Navigate the prospective spot at several times of the day to see how easy it is to get to and park. One of the problems of Pick Angels is that at evening rush hour, Brock Rd is a traffic jam getting back to the 401. I'm sure this discourages potential customers.
Good Luck